图Ⅲ—10所示组合机床滑台的检验项目为______。
参考答案：B
设直线y=2x-4与抛物线y2=4x交于A，B两点（点A在第一象限）．
（Ⅰ）求A，B两点的坐标；
（Ⅱ）若抛物线y2=4x的焦点为F，求cos∠AFB的值．
-How much are the pants?
-_____[ ]
A. It's black.
B. It's 20 yuan.
C. They are 80 $.
D. They're red.
